Cancer guide
Colon cancer
One of the most preventable cancers — screening from age 45 catches most cases before they become invasive, and MSI/MMR testing shapes modern treatment.
Symptoms of colon cancer
Early signs, which ones need a same-week doctor visit, and what screening looks like.
Read the symptoms guideWhat to ask after a colon cancer diagnosis
The questions that shape treatment — biomarkers, staging, surgery, chemo, second opinions.
Read the questions guideWhat to know first
- Screening (colonoscopy or stool-based tests) is recommended starting at 45.
- Rising rates in adults under 50 — don't dismiss symptoms because of age.
- MSI/MMR testing determines whether immunotherapy is an option.
When to see a doctor
- Blood in the stool or rectal bleeding
- A change in bowel habits lasting more than a few weeks
- Unexplained anemia, weight loss, or abdominal pain
Related guides
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